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It's using the air shafts.
In space no one can hear you scream and you'll be screaming when your chest opens up because sometimes the scariest things come from within. This time it's war but remember there are some places in the universe you don't go alone so you might wanna bring a firearm. What I am trying to say here is go ahead and become missing in the fight of your life against these extra terrestrials but don't let this interfere with any of the novels or I'll go all predator on yea ass! Do you understand scooter?
..........The extremely humble owner of "THE ROOKIE" #2487/3000.....NOCTURNAL (Rewrite) Byron Metz (as "Baldwin Metz," medical examiner for San Francisco police)